# US 12,110,387 B2 · Highly Co2-permeable and selective polymer blend membrane and process for preparing the same

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- Number: US 12,110,387 B2
- Document ID: US12110387B2
- Status: Granted
- Kind: B2
- Application number: 18/451,916
- Filed: 2023-08-18
- Published: 2023-12-21
- Granted: 2024-10-08
- Earliest claimed: 2021-05-06
- Assignees: Sogang University Research & Business Development Foundation
- Applicants: Sogang University Research & Business Development Foundation
- Inventors: Jong Suk Lee; Munsuk Seong; Heseong An; Ju Ho Shin
- Web page: https://patentgrep.com/patent/US12110387B2

## CPC

- B01D 67/0006: {by chemical reactions (in-situ polymerisation, polycondensation, cross-linking or reaction for manufacturing composite membranes B01D69/125)}
- C08L 53/00: Compositions of block copolymers containing at least one sequence of a polymer obtained by reactions only involving carbon-to-carbon unsaturated bonds; Compositions of derivatives of such polymers
- B01D 53/228: {characterised by specific membranes}
- B01D 69/125: {In situ manufacturing by polymerisation, polycondensation, cross-linking or chemical reaction}
- B01D 71/40: Polymers of unsaturated acids or derivatives thereof, e.g. salts, amides, imides, nitriles, anhydrides, esters
- B01D 71/52: Polyethers
- B01D 71/56: Polyamides, e.g. polyester-amides
- B01D 71/64: Polyimides; Polyamide-imides; Polyester-imides; Polyamide acids or similar polyimide precursors
- B01D 71/68: Polysulfones; Polyethersulfones
- B01D 71/72: Macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds, not provided for in a single one of the groups B01D71/46 - B01D71/70 {and B01D71/701 - B01D71/702}
- C08F 283/04: on to polycarbonamides, polyesteramides or polyimides {(C08F283/004 takes precedence)}
- C08L 71/00: Compositions of polyethers obtained by reactions forming an ether link in the main chain (of polyacetals C08L59/00; of epoxy resins C08L63/00; of polythioether-ethers C08L81/02; of polyether-sulfones C08L81/06); Compositions of derivatives of such polymers
- C08L 71/02: Polyalkylene oxides
- C08L 77/00: Compositions of polyamides obtained by reactions forming a carboxylic amide link in the main chain (of polyhydrazides C08L79/06; of polyamideimides or polyamide acids C08L79/08); Compositions of derivatives of such polymers
- B01D 2256/10: Nitrogen
- B01D 2256/12: Oxygen
- B01D 2256/16: Hydrogen
- B01D 2256/20: Carbon monoxide
- B01D 2256/245: Methane
- B01D 2257/504: Carbon dioxide
- C08G 69/40: Polyamides containing oxygen in the form of ether groups (C08G69/12, C08G69/32 take precedence)
- C08L 2205/02: containing two or more polymers of the same C08L -group
- Y02C 20/40: of CO2
- Y02E 60/10: Energy storage using batteries
- B01D: SEPARATION (separating solids from solids by wet methods B03B, B03D; by pneumatic jigs or tables B03B; by other dry methods B07; magnetic or electrostatic separation of solid materials from solid materials or fluids, separation by high-voltage electric fields B03C; centrifuges, vortex apparatus B04; presses per se for squeezing-out liquid from liquid-containing material B30B9/02; treatment of water C02F, e.g. softening by ion-exchange C02F1/42; {arrangements of air intake cleaners in gas turbine plants F02C7/05} ; arrangements or mounting of filters in air-conditioning, air-humidification or ventilation F24F13/28)
- C08L: COMPOSITIONS OF MACROMOLECULAR COMPOUNDS (compositions based on polymerisable monomers C08F, C08G; artificial filaments or fibres D01F; textile treating compositions D06)
- C08F: MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08G: MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- Y02C: CAPTURE, STORAGE, SEQUESTRATION OR DISPOSAL OF GREENHOUSE GASES [GHG]
- Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION

## Abstract

A polymer blend membrane includes a polyether-based copolymer and a polyether polymerized in situ and has high permeability and high selectivity for carbon dioxide. In the polymer blend membrane, the free volume of the polyether-based copolymer is greatly increased, and the adsorption capacity for carbon dioxide is enhanced. Thus, it can have excellent mechanical properties and excellent permeability and selectivity for carbon dioxide.

## Claims

### Claim 1

A process for preparing a polymer blend membrane, comprising:
(1) dissolving a polyether-based copolymer resin, a polyether oligomer containing a vinyl group, and an initiator in a solvent;
(2) subjecting the polyether oligomer containing a vinyl group to in-situ radical polymerization; and
(3) molding a product obtained in step (2) in the form of a membrane and removing the solvent therefrom.

### Claim 2 (depends on 1)

The process for preparing a polymer blend membrane of claim 1, wherein the polyether (B) has a weight average molecular weight of 200 to 1,500 g/mole.

### Claim 3 (depends on 1)

The process for preparing a polymer blend membrane of claim 1, wherein the solvent comprises at least one of the group consisting of ethanol, water, N-methyl-2-pyrrolidone (NMP), dimethylformamide (DMF), dimethylacetamide (DMAc), and mixtures thereof.

### Claim 4 (depends on 3)

The process for preparing a polymer blend membrane of claim 3, wherein the solvent is a mixed solvent of 70% by weight of ethanol and 30% by weight of water.

### Claim 5 (depends on 1)

The process for preparing a polymer blend membrane of claim 1, wherein the initiator comprises at least one of the group consisting of benzoyl peroxide (BPO), di-tert-butyl peroxide (DTAP), potassium persulfate (KPS), 2,2′-azobis(2-methylpropionitrile (AIBN), and 4,4′-azobis-4-cyanopentanoic acid (ACVA).

### Claim 6 (depends on 5)

The process for preparing a polymer blend membrane of claim 5, wherein the initiator comprises benzoyl peroxide (BPO).

### Claim 7 (depends on 1)

The process for preparing a polymer blend membrane of claim 1, wherein the in-situ radical polymerization of the polyether oligomer containing a vinyl group is carried out at a temperature of 60 to 80° C. for 0.5 to 24 hours.